Nodes versus Attributes

Given:
<abc attrib1="attrib1" attrib2="attrib2"></abc>
Versus:
<abc>
<attrib1>attrib1</attrib1>
<attrib2>attrib2</attrib2>
</abc>
I notice that the nodes would be indexed as "attribute" in the first case and "element" in the latter case. Is there any performance difference between the way this data is indexed and referenced? When is the proper time to use attributes versus nodes - as in both cases above, I find data access to be similar.
Is there a performance hit upon one over the other?

Never mind - I found a great explanation on this topic in "Definitive Guide" - Seems performance 'shouldn't' be affected either way.

Similar Messages

How to create a node with attributes at runtime in webdynpro for ABAP?

Hi Experts,
         How to create a node with attributes at runtime in webdynpro for ABAP? What classes or interfaces I should use? Please provide some sample code.
I have checked IF_WD_CONTEXT_NODE_INFO and there is ADD_NEW_CHILD_NODE method. But this is not creating any node. I this this creates only a "node info" object.
I even check IF_WD_CONTEXT_NODE but i could not find any method that creates a node with attribute.
Please help!
Thanks
Gopal

Hi
   I am getting the following error while creating a dynamic context node with 2 attributes. Please help me resolve this problem.
Note
The following error text was processed in the system PET : Line types of an internal table and a work area not compatible.
The error occurred on the application server FMSAP995_PET_02 and in the work process 0 .
The termination type was: RABAX_STATE
The ABAP call stack was:
Method: IF_WD_CONTEXT_NODE~GET_STATIC_ATTRIBUTES_TABLE of program CL_WDR_CONTEXT_NODE_VAL=======CP
Method: GET_REF_TO_TABLE of program CL_SALV_WD_DATA_TABLE=========CP
Method: EXECUTE of program CL_SALV_WD_SERVICE_MANAGER====CP
Method: APPLY_SERVICES of program CL_SALV_BS_RESULT_DATA_TABLE==CP
Method: REFRESH of program CL_SALV_BS_RESULT_DATA_TABLE==CP
Method: IF_SALV_WD_COMP_TABLE_DATA~MAP_FROM_SOURCE_DATA of program CL_SALV_WD_C_TABLE_V_TABLE====CP
Method: IF_SALV_WD_COMP_TABLE_DATA~MAP_FROM_SOURCE of program CL_SALV_WD_C_TABLE_V_TABLE====CP
Method: IF_SALV_WD_COMP_TABLE_DATA~UPDATE of program CL_SALV_WD_C_TABLE_V_TABLE====CP
Method: IF_SALV_WD_VIEW~MODIFY of program CL_SALV_WD_C_TABLE_V_TABLE====CP
Method: IF_SALV_WD_COMPONENT~VIEW_MODIFY of program CL_SALV_WD_A_COMPONENT========CP
My code is like the following:
TYPES: BEGIN OF t_type,
            CARRID TYPE sflight-carrid,
            CONNID TYPE sflight-connid,
         END OF t_type.
Data: i_struc type table of t_type,
dyn_node   type ref to if_wd_context_node,
rootnode_info   type ref to if_wd_context_node_info,
i_node_att type wdr_context_attr_info_map,
wa_node_att type line of wdr_context_attr_info_map.
      wa_node_att-name = 'CARRID'.
      wa_node_att-TYPE_NAME = 'SFLIGHT-CARRID'.
      insert wa_node_att into table i_node_att.
      wa_node_att-name = 'CONNID'.
      wa_node_att-TYPE_NAME = 'SFLIGHT-CONNID'.
      insert wa_node_att into table i_node_att.
clear i_struc. refresh i_struc.
select carrid connid into corresponding fields of table i_struc from sflight where carrid = 'AA'.
rootnode_info = wd_context->get_node_info( ).
rootnode_info->add_new_child_node( name = 'DYNFLIGHT'
                                   attributes = i_node_att
                                   is_multiple = abap_true ).
dyn_node = wd_context->get_child_node( 'DYNFLIGHT' ).
dyn_node->bind_table( i_struc ).
l_ref_interfacecontroller->set_data( dyn_node ).
I am trying to create a new node. That is
CONTEXT
- DYNFLIGHT
CARRID
CONNID
As you see above I am trying to create 'DYNFLIGHT' along with the 2 attributes which are inside this node. The structure of the node that is, no.of attributes may vary based on some condition. Thats why I am trying to create a node dynamically.
Also I cannot define the structure in the ABAP dictionary because it changes based on condition
Message was edited by: gopalkrishna baliga

Dynamic Table control with context nodes and attributes?

Hi all
I have node and attributes in context. i want to create table dynamically using this node and attributes, can anyone give code how to do this???
Thanks
Madhan.

Hi
Go through this [link|http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/80a3de18-ee00-2d10-bfb3-946d7e00fd91?quicklink=index&overridelayout=true].
Regards
Arun.P

Read a XML node value/attribute value from a CLOB

Hello,
I can write SQL/ - PL/SQL "straightforward" but now I have a problem what is to big for me. I hop that someone can help.
We create by code a xml structure and write these into the oracle database CLOB field. I'm sorry to say that a xml text structure is written into a clob in stead of a xmltype field. (it's a design failure?) It's a large xml structure. I believe I can't attach a file so I put at the end of this discussion a light example of the xml structure.
It's a xml with quartervalue's, so there are 35040 detail rows (24h * 4 * 365days). I want to accumulate the the attribute Amount value 9. The amount value is in the Detail node a attribute but at the end you can see that for the DST are also 4 value's, but these are not attribute value's but node value's. (In this case it are four value's in some cases there is one DST amount value.
Can somebody help me how to accumulate all the detail attribute value Amount with the node value Amount of the DST tag?
XML structure:
<?xml version="1.0"?>
<Message xmlns:ns1="http://automaticdealcapture/">
    <BusinessDocument messageDateTime="2013-10-25T13:59:31+02:00" ediReference="LO-461967" messageName="New" businessSector="Z" documentFunction="Original">
        <DocumentData>
            <ns1:Adcs>
                <ns1:Package>
                    <ns1:Deal>
                        <ns1:ProductCode>PWCODE</ns1:ProductCode>
                        <ns1:Action>NEW</ns1:Action>
                        <ns1:Memo1>MemoField</ns1:Memo1>
                        <ns1:Details>
                            <ns1:Detail Dates="2014-01-01" Datee="2014-01-01" Times="00:00:00" Timee="01:00:00" Amount="0.0153" Price="11.111"/>
                            <ns1:Detail Dates="2014-01-01" Datee="2014-01-01" Times="01:00:00" Timee="02:00:00" Amount="0.015" Price="22.222"/>
                            etc. 350040 detail rows.
                        </ns1:Details>
                        <ns1:DSTS>
                            <ns1:Year Val="2014">
                                <ns1:DST Period="1">
                                    <ns1:Amount>0.0146</ns1:Amount>
                                    <ns1:Price>33.333</ns1:Price>
                                </ns1:DST>
                                <ns1:DST Period="2">
                                    <ns1:Amount>0.0222</ns1:Amount>
                                    <ns1:Price>33.333</ns1:Price>
                                </ns1:DST>
                                <ns1:DST Period="3">
                                    <ns1:Amount>0.0444</ns1:Amount>
                                    <ns1:Price>33.333</ns1:Price>
                                </ns1:DST>
                                <ns1:DST Period="4">
                                    <ns1:Amount>0.0146</ns1:Amount>
                                    <ns1:Price>33.333</ns1:Price>
                                </ns1:DST>
                            </ns1:Year>
                        </ns1:DSTS>
                    </ns1:Deal>
                </ns1:Package>
            </ns1:Adcs>
        </DocumentData>
    </BusinessDocument>
</Message>

From what I know, extracting the "Amount" values in the Details section and the "Amount" values in the DSTS section would be two different SELECT statements.
Both of these will use XMLTable() to extract the values.
BTW - If you need more information on this, post up in the XML/XML DB forum section for more complex help. (eg getting YEAR with the DSTS Amount values)
as far as XML size goes, I've seen oracle handle a 100MB XML document without problems.
(just understand, it will be 'slow')
This one will give you the Amount values from the DSTS section:
with xml_data as ( SELECT
XMLType('<?xml version="1.0"?>
<Message xmlns:ns1="http://automaticdealcapture/">
    <BusinessDocument messageDateTime="2013-10-25T13:59:31+02:00" ediReference="LO-461967" messageName="New" businessSector="Z" documentFunction="Original">
        <DocumentData>
            <ns1:Adcs>
                <ns1:Package>
                    <ns1:Deal>
                        <ns1:ProductCode>PWCODE</ns1:ProductCode>
                        <ns1:Action>NEW</ns1:Action>
                        <ns1:Memo1>MemoField</ns1:Memo1>
                        <ns1:Details>
                            <ns1:Detail Dates="2014-01-01" Datee="2014-01-01" Times="00:00:00" Timee="01:00:00" Amount="0.0153" Price="11.111"/>
                            <ns1:Detail Dates="2014-01-01" Datee="2014-01-01" Times="01:00:00" Timee="02:00:00" Amount="0.015" Price="22.222"/>
                        </ns1:Details>
                        <ns1:DSTS>
                            <ns1:Year Val="2014">
                                <ns1:DST Period="1">
                                    <ns1:Amount>0.0146</ns1:Amount>
                                    <ns1:Price>33.333</ns1:Price>
                                </ns1:DST>
                                <ns1:DST Period="2">
                                    <ns1:Amount>0.0222</ns1:Amount>
                                    <ns1:Price>33.333</ns1:Price>
                                </ns1:DST>
                                <ns1:DST Period="3">
                                    <ns1:Amount>0.0444</ns1:Amount>
                                    <ns1:Price>33.333</ns1:Price>
                                </ns1:DST>
                                <ns1:DST Period="4">
                                    <ns1:Amount>0.0146</ns1:Amount>
                                    <ns1:Price>33.333</ns1:Price>
                                </ns1:DST>
                            </ns1:Year>
                        </ns1:DSTS>
                    </ns1:Deal>
                </ns1:Package>
            </ns1:Adcs>
        </DocumentData>
    </BusinessDocument>
</Message>') as XMLDATA from dual
select Y.amount
from xml_data X,
XMLTable( XMLNAMESPACES( 'http://automaticdealcapture/' as "ns1"),
   '/Message/BusinessDocument/DocumentData/ns1:Adcs/ns1:Package/ns1:Deal/ns1:DSTS/ns1:Year/ns1:DST'
    passing X.XMLData
COLUMNS
    amount Number PATH '/ns1:DST/ns1:Amount'
) Y;
Replace the XMLTable() with the one below to get the Amount from the Details section:
XMLTable( XMLNAMESPACES( 'http://automaticdealcapture/' as "ns1"),
   '/Message/BusinessDocument/DocumentData/ns1:Adcs/ns1:Package/ns1:Deal/ns1:Details/ns1:Detail'
    passing X.XMLData
COLUMNS
    amount number PATH '/ns1:Detail/@Amount'
) Y;

Nodes and attributes

Hi,
I want to know that is there any restrictions to declare nodes and attributes that come under these nodes?
For Eg, the requirement is to create a miscellaneos invoice through a ABAP web dynpro screen.There are many fields like Vendor name , Invoice number, VAT etc.How i can group these in to nodes and attributes? It is as we like or is there any standards to group?
Regards,
Charumathi.B

hi charumathi.......
the attributes can be combined into any node you wish..
but if you are going to represent a table or need to have a set of values for a single attribute then put it under a node and mention the cardinality as 0...n. its always better to create an attribute under a node rather directly under a context, for attributes canoot be mapped directly from comonent controller. only nodes can be mapped. so it is always bettter to have attributes under nodes.
---regards,
alex b justin

Mapping Node and Attributes

Hello all,
            I am using Process Composer for a process design.
I have a human activity and an automated acitivity.
Human Activity                                                 Automated Activity
+ Type Code (node)----
Type Code (node)
   - TypeCode (attribute)----
text() (attirbute)
Above shows the mapping. Now I map the node and then i map the attribute. I save it.
The above mapping is for input mapping of the automated activity. Suppose if leave the mapping screen and come back, the mapping is automatically gone. Though i saved it. The TypeCode (node) is mapped to text() with an error (after i change screen. That will be error of course).
Have any of you faced any similar issue before?

Problem solved.
1. The cardinality of the nodes was not matching.
2. Attributes were matched instead of matching nodes.
Thnks

Access a node's attribute's information

Hello All,
I want to access the a node's attribute's information. I am passing the node as a parameter to a method which is an aanother DC. How do I get this inf ?
Regards
Mrinalini

Hello Mrinalini,
It is simple, use the following code to do so
Iterator iter = wdContext.node<NODE NAME>().getNodeInfo().iterateAttributes();
IWDAttributeInfo attrInfo = null;
    while(iter.hasNext()) {
         attrInfo = (IWDAttributeInfo)iter.next();
         attrInfo.getName();      // To check with attribute name
                     attrInfo.getDataType().getName();        // To check with attribute type
Regards
Mohammad Bohra

How to create a node with attribute?

hi,
does anyone can help with creating an XML node with only attributes but no value?
e.g.
<root>
   <category node_id='ND1'>
      <value id='1'>some value in here</value>
      *<extra_node desc="this is the new node i want to create"/>*
   </category>
   <category node_id='ND2'>
      <value id='1'>some value in here</value>
   </category>
</root>in the example, what i want to do is to get the category using XPath, and insert one attribute node into it.
anyone can help? sincerely appreciated!

No, the question was not about attributes with no value, it was about elements with no value.
Now I know that the "value" of an element is a meaningless term in XML, but the OP's example shows that the question was how to produce an empty element. Even though the text describes the operation as "insert one attribute node", which doesn't agree with the example.
It's easy to create an empty element using DOM, but we have no idea whether the OP is talking about DOM programming or what.

Not able to display the Node context attributes to table

Hi Friends,
Issue: Currently i am reading the Node parameters and assigning the parameters to the Context of the mainView.
Then displaying the attributes into table here i am using a iterator to fetch the attributes.
But its reading only one record to the table not all the attributes.
Here i am attaching the code:
Node is EvaluationDimensions and attributes are Dimension and Selected_values.
Line: -
public void wdDoInit()
//@@begin wdDoInit()
try
IBONodeElement test = null;
test = (IBONodeElement)wdThis.wdGetDefinedimensiongafController().wdGetContext().nodeEvaluationDimensions().currentEvaluationDimensionsElement().model();
IBONode testNode = test.getBONode();
Iterator it = testNode.iterator();
IBONodeElement itElement = null;
while(it.hasNext())
itElement = (IBONodeElement)it.next();
//wdContext.nodeEvaluationDimensions().createAndAddEvaluationDimensionsElement();
wdContext.createAndAddEvaluationDimensionsElement();
wdContext.currentEvaluationDimensionsElement().setDimension(itElement.getAttributeValue("KPIParameterDefinitionName").toString());
wdContext.currentEvaluationDimensionsElement().setSelected_Values(itElement.getAttributeValue("ParameterSelectedValuesText").toString());
} catch (RuntimeException e) {
e.printStackTrace();
wdThis.wdGetDefinedimensiongafController().wdGetAPI().getComponent().getMessageManager().reportSuccess(e.toString());
//@@end
Line: -
Could you suggest me some alternatives to show all records into table??
Thanks & Best Regards, Prabhu(9886855725)
Edited by: Armin Reichert on Apr 24, 2008 12:57 PM

Hi Prabhu
IBONodeElement test = null;
test = (IBONodeElement)wdThis.wdGetDefinedimensiongafController().wdGetContext().nodeEvaluationDimensions().currentEvaluationDimensionsElement().model();
What is this model() .
You remove the try catch method once and test it to trace the error.Why cant you use typed AccessAPI to fetch the values from the node element.Is your node have more elements test it.By getting the size of the node.
That too you are setting values to only current context element .Not for other elements.Everytime you are setting the values to current context element,thats why you are getting only one element values at a time.Iterate properly and try to set the values for each element
wdContext.currentEvaluationDimensionsElement().setDimension(itElement.getAttributeValue("KPIParameterDefinitionName").toString());
See the above code every time you are setting to currentNode lement notforother elements.
Regards
kalyan

Node - Dynamic Attributes

Hi,
I have a node 'CONF' with attribute ATNAM01. I used a ZSTRUC to create this node. Here my requirement is that based on user inputs I will execute a FM, I will get no of entries in my itab. I need to assign attributes based on itab entries to 'CONF' node dynamically ....
Ex: ATNAM01, ATNAM02....ATNAMNN.
Is it possible? How? Any code/link!
Regards,
Sateesh...

Hi sateesh,
        Is your problem statement is some thing like this .Based on data in attribute ATNM01 you need to perform correpsonding treatment .
DATA:
    node_check                          TYPE REF TO if_wd_context_node,
    elem_check                          TYPE REF TO if_wd_context_element,
    stru_check                          TYPE if_start_ior=>element_check ,
    item_check_attribute                LIKE stru_check-check_attribute.
element = wd_context->get_lead_selection( ).
index = wdevent->get_string( 'INDEX' ).
navigate from <CONTEXT> to <CHECK> via lead selection
node_check = wd_context->get_child_node( name = if_start_ior=>wdctx_check ).
get element via lead selection
elem_check = node_check->get_element( ).
get single attribute
elem_check->get_attribute(
    EXPORTING
      name = `CHECK_ATTRIBUTE`
    IMPORTING
      value = item_check_attribute ).
if index EQ 2.
elem_check->set_attribute( name = 'CHECK_ATTRIBUTE' value = Abap_true ).
endif.
if index EQ 1.
elem_check->set_attribute( name = 'CHECK_ATTRIBUTE' value = Abap_false ).
endif.
endmethod.
Point I want make is based on data populated in attribute <b>check_attribute</b>
.I have identified index of attribute and accordingly performed treatment.
Hope this will help you .
If yes give points.
Cheers!
Parag

Create dinamic nodes and attributes

Hi Forum!
I have created a WDA with 2 views. On the START_VIEW, the user can input details from an installation. I want to display an error on the START_VIEW when a condition is false.
How I can create a node with an attribute dinamically to display this error if the message Text View is not defined on the view?
Could you give me a any sample of code, please?
Thank you very mucha and regards,
Manuel.

Hi Manuel,
Pleaes try this out. This is how to create an attribute dynamically.
DATA: attribute TYPE wdr_context_attribute_info.
DATA: main_node TYPE REF TO if_wd_context_node_info.
"get main node
main_node = wd_context->get_node_info( ).
"set name for this attribute
attribute-name = 'SOME_NAME_4_ATTR'.
"set data type for this attribute
attribute-type_name = 'SOME_DATA_TYPE'.
"add attribute into context node
main_node->add_attribute( attribute_info = attribute ).
Thanks.
Regards,
Georgy Norkin

Binding Dropdownbykey to child node's attribute dynamically

Hi..
i am creating a child node "CHILD" and attribute attached to it "ATTR" dynamically. Also i create a dynamic dropdownbykey element and trying to attach the ATTR. then i get the following error. zdyn_date is data element with some fixed values. Please let me know as quick as possible.
<b>"Adapter error in DROPDOWN_BY_KEY "KEY1" of view "ZDYN_DDKEY.MAIN": Context binding for property SELECTED_KEY cannot be resolved: The MAIN.1.CHILD node does not contain any elements"</b>
METHOD WDDOMODIFYVIEW .
DATA: LR_ROOT_INFO TYPE REF TO IF_WD_CONTEXT_NODE_INFO,
        LR_CHILD_INFO TYPE REF TO IF_WD_CONTEXT_NODE_INFO,
        cl_des type REF TO CL_ABAP_ELEMDESCR,
ATTR_INFO TYPE WDR_CONTEXT_ATTRIBUTE_INFO.
LR_ROOT_INFO = WD_CONTEXT->GET_NODE_INFO( ).
CALL METHOD lr_root_info->ADD_NEW_CHILD_NODE
      EXPORTING
        NAME                         = 'CHILD'
      RECEIVING
        CHILD_NODE_INFO              = lr_child_info.
ATTR_INFO-NAME = 'ATTR'.
ATTR_INFO-TYPE_NAME = 'ZDYN_DATE'.
CALL METHOD lr_child_info->ADD_ATTRIBUTE
    EXPORTING
      ATTRIBUTE_INFO = ATTR_INFO.
DATA: LR_ROOT_CONTAINER TYPE REF TO CL_WD_TRANSPARENT_CONTAINER,
        LE_DD_KEY1 TYPE REF TO CL_WD_DROPDOWN_BY_KEY.
LR_ROOT_CONTAINER ?= VIEW->GET_ELEMENT( 'ROOTUIELEMENTCONTAINER' ).
CALL METHOD CL_WD_DROPDOWN_BY_KEY=>NEW_DROPDOWN_BY_KEY
    EXPORTING
      BIND_SELECTED_KEY      = 'CHILD.ATTR'
      ID                     = 'KEY1'
    RECEIVING
      CONTROL                = LE_DD_KEY1. .
CALL METHOD CL_WD_MATRIX_LAYOUT=>NEW_MATRIX_LAYOUT
    EXPORTING
      CONTAINER = LR_ROOT_CONTAINER.
CALL METHOD CL_WD_MATRIX_HEAD_DATA=>NEW_MATRIX_HEAD_DATA
    EXPORTING
      ELEMENT = LE_DD_KEY1.
CALL METHOD LR_ROOT_CONTAINER->ADD_CHILD
    EXPORTING
    INDEX     =
      THE_CHILD = LE_DD_KEY1.
ENDMETHOD.

Hi ,
can u try to create the node and its attribute in some other method..like in some action or in WDDOINIT instead of wddomodifyview .bcoz its recommended not to modify the data of node in wddomodifyview ..
hope it will solve ur problem .
Regards
Yash

How can I get the adf-tree-node's attributes?

I want get the attributes in the method of "selectionListener"?
How can I do?
I only know :
RichTree treeId;
RowKeySet keySet = treeId.getSelectedRowKeys();
Thanks!

You don't want to maintain a reference to the last selected node, but to the last selected path. Nodes within a tree are addressed using a TreePath, with contains references to each node from the root, down to a specific node. Look at the JavaDocs of javax.swing.tree.TreePath for more info.
Also, JTree has getter/setter methods for the selectionPath.

How to access parent, child nodes and attributes in XML?

EXAMPLE CODING:
[Embed("assets/Try.xml", mimeType="application/octet-stream")]
private static consTTest:Class;
public static function getTestXML() : XML
var baTest:ByteArrayAsset = ByteArrayAsset( new test() );
var xmlTest:XML = new XML( baTest.readUTFBytes( baTest.length ) );
return xmlTest;
public function SetTest():void
     var xml:XML = XMLResource.getTestXML();
     var XMLDoc:XMLDocument = parseXML(xml);
     var decoder:SimpleXMLDecoder = new SimpleXMLDecoder(true);
     var resultObj:Object = decoder.decodeXML(XMLDoc);
     trace(resultObj.Roots.Child[0].ChildTitle); //Output: ChildTesting -> CAN GET IT, NO PROBLEM.
QUESTIONS:
(1) How to get the output for
trace(resultObj.Roots.Child[0].Child1.Inside[0].InsideTitle); //GOT ERROR, THE OUTPUT I NEED IS InsideTesting1.
(2) How to get the output for
trace(resultObj.Roots.Child[0].Child1.Inside[0].Tasks.Task[0].TaskTitle); //GOT ERROR, THE OUTPUT I NEED IS TaskTesting1.
Anyone can help me to solve this problem? Thanks.
Regards,
Jessie

Hi.
You have error in Try.xml in row 2:
<Child ... "/>
Delete '/', its end of this child.
This is problem...

Search the xml node by attributes and display the entire row

I am having a table with two columns say
school_name string type
student_notebookprice xmldata
how do i search with oracle query having student_id=102 and schoolname="abc_school" with notebook price 20, how do i get only one single row
abc_school,
<students>
     <student id="101">
     <notebookprice>12</notebookprice>
     </student>
     <student id="102">
          <notebookprice>20</notebookprice>
          <notebookprice>30</notebookprice>
          <notebookprice>40</notebookprice>
</student>
</students>
def_school,
<students>
     <student id="301">
     <notebookprice>10</notebookprice>
     </student>
     <student id="302">
          <notebookprice>15</notebookprice>
          <notebookprice>16</notebookprice>
</student>
</students>

yes . what i want based on search criteria i need to display that row . initially i have tried with the below query
SELECT school_name,
extractvalue(value(x), '//id') as student_id ,
extractValue(value(x), '//teacher') AS teacher
FROM school t ,
TABLE( XMLSequence( Extract(t.obj_xml, '/students/student[id=101 and teacher="abc"]'))) x
where existsNode(t.obj_xml, '/students/student[id=101 and teacher="abc"]') = 1
but when i want to add the second student in the search , i am failed to produce the second student information in the output and i can able to add it to where clause and but how to display the student info in the output . The xmltable option that u have specified looks good but what i fear is , it produce multiple combination with all the tags in the xml with the other columns in the table . will it cause any performence issue .
<students>
<student >
<id>101</id>
<teacher>abc</teacher>
</student>
<student >
<id>102</id>
<teacher>xyz</teacher>
<teacher>onp</teacher>
<teacher>rsm</teacher>
</student>
</students>
SELECT school_name,
extractvalue(value(x), '//id') as student_id ,
extractValue(value(x), '//teacher') AS teacher
FROM school t ,
TABLE( XMLSequence( Extract(t.obj_xml, '/students/student[id=101 and teacher="abc"]'))) x
where existsNode(t.obj_xml, '/students/student[id=101 and teacher="abc"]') = 1
and existsnode(t.obj_xml, '/students/student[id=102 and teacher="xyz"]') = 1

Nodes versus Attributes

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